关键词: 环形邻域, 显著特征, 自适应分层, 增材制造, 数字孪生

Abstract: To improve the surface accuracy and manufacturing efficiency of multi-feature forming,an adaptive forward design approach for slicing of Additive Manufacturing (AM) based on Ring Neighborhood (RN) was proposed.The multi-order RN of the model was constructed.The model saliency was calculated based on Gaussian weighted average of the mean curvature with variable scale,and the salient features were determined by dynamic clustering.The initial layer thicknesses were determined based on the change of morphological saliency lines obtained recursively,and a self-consistent Slicing Programming Forward Design (SPFD) mathematical model was established.Further,the virtual printing of AM was realized with digital twin technology.The layered projection areas of the virtual printing model on the positive and lateral planes in the printing coordinate system were used as material thermo-plastic constraints,and the double-linked circular list and octree were applied to calculate the Boolean union of the projection area set to realize the SPFD of multi-feature iteration.The surface roughness of different feature regions of the printed model was measured by a contact profilometer.The results showed that the approach could effectively slice multi-feature manifold models adaptively,which was helpful to improve the layered manufacturing efficiency and quality of 3D Printing and 4D Printing.

Key words: ring neighborhood, salient feature, adaptive slicing, additive manufacturing, digital twin